Police said Linares had arrived for work at 5:10 a.m. Thursday and a staff member became concerned when they noticed the pool was still locked. When staff was unable to located her, they called police.

"It's a very difficult day for our staff here today. They lost not just a coworker, but a friend who they admired and adored," YMCA Spokesperson Molly Thompson said.

The 911 calls were released on Thursday:

Dispatch: Is she breathing at all?

Caller: She's doing CPR

Dispatch: She is doing CPR? Stay on the line. Help is on the way

Dispatch: Is it going to be the lifeguard that was just called about missing? You couldn't find her?

Caller: Yes, yes

Dispatch: OK. We do have everybody on the way just keep pumping her chest hard and fast until we get help there